xuyangzhong opened a new pull request, #24068:
URL: https://github.com/apache/flink/pull/24068
## What is the purpose of the change
Currently, the implementation of the window aggregate op with new WINDOW TVF
syntax is strongly bound to slicing windows such as TUMBLE, HOP and CUMULATE.
This brings difficulties to the introduction of unslicing windows such as
SESSION.
This pr aims to refactor some classes about window aggregate op to do the
preparation for the introduction of unslicing windows.
## Brief change log
*(for example:)*
- *add two package 'groupwindow' and 'windowtvf' under
'org.apache.flink.table.runtime.operators.window' to split the different
implements about the legacy group window agg and the new window tvf agg*
- *move the classes related into these two new packages*
- *extract abstract class about slicing window processor and operator*
## Verifying this change
Existent tests can cover this changes.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? no
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